To speak of this subject you must... explain the nature of the resistance of the air, in the second the anatomy of the bird and its wings, in the third the method of working the wings in their various movements, in the fourth the power of the wings and the tail when the wings are not being moved and when the wind is favourable to serve as guide in various movements.

We might say that the earth has the spirit of growth; that its flesh is the soil.

The mind that engages in subjects of too great variety becomes confused and weakened.

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.

Obstacles cannot bend me. Every obstacle yields to effort.

You grow in reputation like bread in the hands of a child.

Our body is dependent on heaven and heaven on the Spirit.